Cisco 521SG Administration Guide - Page 150

Configuring Security, Quality, and Network Features Configuring VLAN Settings 5 Parameter Description Enable PC Port VLAN Tagging Enables VLAN and priority tagging on the phone data port (802.1p/q). This feature facilities tagging of the VLAN ID (802.1Q) and priority bits (802.1p) of the traffic coming from the PC port of the IP phone. Choose Yes to enable the tagging algorithm. Defaults to No. PC Port VLAN ID The phone tags all of the untagged frames coming from the PC. (It does not tag frames with existing tags). Ranges from 0 to 4095. Defaults to 0. Enable CDP Enable CDP only if you are using a switch that has CDP. CDP is negotiation-based and determines on which VLAN the IP phone resides. Enable LLDP-MED Choose yes to enable LLDP-MED for the phone to advertise itself to devices that use that discovery protocol. (By default, this setting is enabled.) When the LLDP-MED feature is enabled, after the phone has initialized and Layer 2 connectivity is established, the phone sends out LLDP-MED PDU frames. If the phone receives no acknowledgment, the manually configured VLAN or default VLAN is used if applicable. If CDP is used concurrently, a waiting period of 6 seconds is used. The waiting period increases the overall startup time for the phone. Network Startup Delay Enter the delay in seconds for the switch to get to the forwarding state before the phone sends out the first LLDP-MED packet. The default delay is 3 seconds. For configuration of some switches, it might be necessary to increase this value to a higher value for LLDP-MED to work. Configuring a delay can be important for networks that use Spanning Tree Protocol. Cisco Small Business SPA300 Series, SPA500 Series, and WIP310 IP Phone Administration Guide 149